linux-kernel - Re: [PATCH 00/10] AXFS: Advanced XIP filesystem

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Message-ID: <6934efce0809021047h40127b72u5d35f457e0546635@mail.gmail.com>
Date:	Tue, 2 Sep 2008 10:47:45 -0700
From:	"Jared Hulbert" <jaredeh@...il.com>
To:	"Jörn Engel" <joern@...fs.org>
Cc:	"Geert Uytterhoeven" <Geert.Uytterhoeven@...ycom.com>,
	Linux-kernel@...r.kernel.org, linux-embedded@...r.kernel.org,
	linux-mtd <linux-mtd@...ts.infradead.org>, tim.bird@...sony.com,
	cotte@...ibm.com, nickpiggin@...oo.com.au
Subject: Re: [PATCH 00/10] AXFS: Advanced XIP filesystem

>> How is one expected to read those last 4 bytes of a loopbacked file?
>> Are they unreadable?  We can add the padding.   I am just wondering if
>> this is a bug or a known limitation in the loopback handling or if
>> there is a different safer way of reading block devs with truncated
>> last blocks.
>
> Can't you just include the final magic into the last block, thereby
> making the size a clean multiple of 4k?  It looks as if you have some
> padding before the magic anyway.  So you just have to make sure the
> padding is at least 4 bytes and write the magic to the end of it.  Apart
> from solving this bug, it should also save you some space. ;)

I'm going to have to look into this n*4K thing.  The image doesn't
need to be aligned.  There shouldn't be any last block to put the
magic in.  But I haven't messed with the mkfs.axfs code for a while.
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